To provide a waveform display apparatus, in which a value of a time axis displayed on a display screen is easy to read because a waveform change rate or waveform change period are only integral values, irrespective of the waveform change period to be set or a high/low speed of the waveform change rate.

The waveform display device for displaying a changing state of a measurement signal on the display screen as a graphic waveform by a continuous line segment is such that a display dot number allocated to an interval of a graduation line along a time axis direction is switched, in response to the waveform change period or the waveform change rate so that the waveform change rate or the waveform change period become integral values, at all times.